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ISO 4377:2012

(Main)

Hydrometric determinations — Flow measurement in open channels using structures — Flat-V weirs

Hydrometric determinations — Flow measurement in open channels using structures — Flat-V weirs

ISO 4377:2012 describes the methods of measurement of flow in rivers and artificial channels under steady or slowly varying conditions using flat-V weirs

Déterminations hydrométriques — Mesure de débit dans les canaux découverts au moyen de structures — Déversoirs en V ouvert

General Information

Status
Published
Publication Date
22-Jul-2012
ICS
17.120.20 - Flow in open channels
Technical Committee
ISO/TC 113/SC 2 - Flow measurement structures
Drafting Committee
ISO/TC 113/SC 2 - Flow measurement structures
Current Stage
9093 - International Standard confirmed
Completion Date
01-May-2024
Ref Project

Relations

Revises
ISO 4377:2002 - Hydrometric determinations — Flow measurement in open channels using structures — Flat-V weirs
Effective Date
28-Feb-2009

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ISO 4377:2012 - Hydrometric determinations -- Flow measurement in open channels using structures -- Flat-V weirsISO 4377:2012 - Hydrometric determinations -- Flow measurement in open channels using structures -- Flat-V weirs
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ISO 4377:2012 - Hydrometric determinations -- Flow measurement in open channels using structures -- Flat-V weirs
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Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 4377
Fourth edition
2012-08-01

Hydrometric determinations — Flow
measurement in open channels using
structures — Flat-V weirs
Déterminations hydrométriques — Mesure de débit dans les canaux
découverts au moyen de structures — Déversoirs en V ouvert




Reference number
ISO 4377:2012(E)
©
ISO 2012

---------------------- Page: 1 ----------------------
ISO 4377:2012(E)

COPYRIGHT PROTECTED DOCUMENT


©  ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
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Fax + 41 22 749 09 47
E-mail copyright@iso.org
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Published in Switzerland

ii © ISO 2012 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 4377:2012(E)
Contents Page
Foreword . v
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 2
4  Symbols . 3
5  Characteristics of flat-V weirs . 4
6  Installation . 4
6.1  Selection of site . 4
6.2  Installation conditions . 7
6.3  Weir structure . 8
6.4  Downstream conditions . 8
7  Maintenance . 8
8  Measurement of head(s) . 9
8.1  General . 9
8.2  Stilling (gauge) wells . 9
8.3  Zero setting . 11
8.4  Location of head measurement sections . 13
9  Discharge relationships . 14
9.1  Equations of discharge . 14
9.2  Effective heads . 15
9.3  Shape factors . 16
9.4  Coefficient of velocity . 16
9.5  Conditions for modular/drowned flow . 18
9.6  Drowned flow reduction factor . 21
9.7  Limits of application . 28
10  Computation of discha
...

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